Homotopy Type Theory wedge sum > history (Rev #2)

Idea

The wedge sum of two types $A$ and $B$, can be defined as the pushout of the span

where the maps pick the base points of $A$ and $B$. This pushout is denoted $A \vee B$ and has basepoint $\star_{A \vee B} \equiv \mathrm{inl}(\star_A)$

Definition

References